Fig. 3.
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Type II burst in dynamic spectra and radio images. Panel a: Combined ORFEES and eCALLISTO dynamic spectrum during the type II burst. Panel b: Imaging of the type II radio sources overlaid as radio contours on AIA 211 Å running difference images showing the evolution of the CME eruption. The radio contours are shown at three NRH frequencies that cover the extent of the type II bands: 150 MHz (blue), 173 MHz (red), and 228 MHz (green). The radio contours represent 40 and 80% of the maximum intensity level in each image.
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